1. FIM Research Center, University of Bayreuth, Bayreuth, Germany
2. Fraunhofer FIT, Project Group Business & Information Systems Engineering, University of Bayreuth, Bayreuth, Germany
3. qbound, and the UCL Centre for Blockchain Technologies, Munich, Germany
4. FIM Research Center, University of Bayreuth, Project Group Business & Information Systems Engineering of the Fraunhofer FIT, Bayreuth, Germany
5. University of Glasgow, School of Computing Science, Glasgow, U.K.